class Settings:
    """存储游戏《AlienInvasion》中所有设置的类"""

    def __init__(self):
        """初始化游戏所有的设置"""
        
        #屏幕设置
        self.screen_width     = 1200
        self.screen_height    = 800
        self.bg_color         = (230,230,230)
        
        #飞船设置
        self.ship_speed       = 1.5
        self.ship_limit       = 3
        
        #子弹设置
        self.bullet_speed     = 1.5
        self.bullet_width     = 3
        self.bullet_height    = 15
        self.bullet_color     = (60,60,60)
        self.bullets_allowed  = 3
        
        #外星人设置
        self.alien_speed      = 1.0
        self.fleet_drop_speed = 10
        #fleet_directon为1表示向右移动，为-1表示向左移动
        self.fleet_direction  = 1

        #加快游戏节奏的速度
        self.speedup_scale = 1.1

        #外星人分数的提高速度
        self.score_scale = 1.5

        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        """初始化随游戏进行变化的设置"""
        self.ship_speed   = 1.5
        self.bullet_speed = 3.0
        self.alien_speed  = 1.0

        #fleet_directon为1表示向右移动，为-1表示向左移动
        self.fleet_direction  = 1

        #计分
        self.alien_points = 50
        
    def increase_speed(self):
        """提高速度设置和外星人分数设置"""
        self.ship_speed   *= self.speedup_scale
        self.bullet_speed *= self.speedup_scale
        self.alien_speed  *= self.speedup_scale

        self.alien_points = int(self.alien_points * self.score_scale)
